Draft of the New Rules of Spanish Traffic Art 1...

Draft of the New Rules of Spanish Traffic Art 179.5

5. To indicate their position to vehicles approaching them from behind, cyclists may use signaling devices indicating the lateral separation of 1.5 meters, which every driver must respect when passing. These devices:

 a) Will be made of flexible material and may include reflective elements.

 b) They may project laterally up to one meter from the longitudinal axis of the bicycle.

 c) They may not compromise the stability of the vehicle